package cn.zhengwenzhou.system.utils;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class IPUtils
{
	
	public static String getRemoteIp(HttpServletRequest request)
	{
		String ipAddress = null;
		// ipAddress = this.getRequest().getRemoteAddr();
		ipAddress = request.getHeader("x-forwarded-for");
		if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress))
		{
			ipAddress = request.getHeader("Proxy-Client-IP");
		}
		if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress))
		{
			ipAddress = request.getHeader("WL-Proxy-Client-IP");
		}
		if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress))
		{
			ipAddress = request.getRemoteAddr();
			if(ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1"))
			{
				// 根据网卡取本机配置的IP
				InetAddress inetAddress = null;
				try
				{
					inetAddress = InetAddress.getLocalHost();
				} catch(UnknownHostException e)
				{
					e.printStackTrace();
				}
				ipAddress = inetAddress.getHostAddress();
			}
			
		}
		
		// 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
		if(ipAddress != null && ipAddress.length() > 15)
		{
			// "***.***.***.***".length() = 15
			if(ipAddress.indexOf(",") > 0)
			{
				ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
			}
		}
		return ipAddress;
	}
}
